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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff91a65b3be7b185f418b47dad0a5d7b7ba868c670b75d651054c31d7664581' 
  AND token = '60/qkC01rgMVZF914B8oJbKDiLHD7CiKMtvy4wNIZ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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