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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e856ad5b9b15ffd113599b9fa9ace4d5550f301449d1f47c5ecf1f3b4bf245' 
  AND token = '0t8GZ4RehvQxZYiiPIX9p1FVYaUhR/2itcjwdpA8+bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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