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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984a8b5a368503f0ca38ceb0ff7caff7b97bacf310c54e35431183af1f2bad76' 
  AND token = 'Vf1NYITPyLkHyx7NAwxPpzOiSTJopcvbcXmDM1Db8Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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