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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a4be538369e759d73d3bb037aa59799d59a4c54c8786c7b42efc5c621a600b' 
  AND token = '7R7yDIp769b3dKlWR+vQ+74aVQdX+3ozxrNZ7wpcHs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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