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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3acb852b1509b5eeb01002ef85801531c62ab114b98bbe9e0e600651f4b1dcd' 
  AND token = '5P2lyTVGr1TQgZ3/htDwRH8B/WZirNcD0yS3c1REdiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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