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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8855a714324561e54c4d1103e80897efe1ead885335d3f8b8c2c3cd4188027' 
  AND token = 'DWHdYTYBAFS8QjMY5KxrULlDM7dXn9bB6K9FHGT3k7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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