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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c63fa823a9f99310de023f9c719deb29d8d9a18888a304399c3a51e5ea2985' 
  AND token = 'S3M33fbAyIt20U7znb2G6d1eF7HosC8+3Ov2sZPkqnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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