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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cff6d7c46159719643348c14515b68cfe8a9b9c7da5b7df51fe18a5cfb43860' 
  AND token = '9AfHudRpUKCLc60rkGtT8GonZTIoyfCm25zu1GeFh7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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