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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19179d5f9bb032ee7b10dbe47e3660b0367d07493c5e4d734a795f387f0d0684' 
  AND token = 'HiUfJNebe8Sw2QX3+ONNd7GIiDWXKfyweMeOfhwdpJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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