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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7caa5dc0e5dd94827018940d1c40b08f313e0e5cffe28ca5d32cb845e9eceb' 
  AND token = '9qbvm2TpvUv1xMfQ/UOVnoI3TWbMKVvU9Fb9EEiBL4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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