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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e275770a5c950ca6b400473c3322b3b42ba15c5a629bc8d6170a8fb8667b5fb' 
  AND token = 'Jom1NfEGv4qghSQg3VCb0RQ1nFiRyBg6CWhKg5KAP6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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