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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b69028f4e5644daec5537cbc887bd7f130239893e2c394895c9776126b78426' 
  AND token = 'FXfw8lBNkf9mBgDe7+lZDU56s7Z+S7IpOMz2PO3NU5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}