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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab007b84d851ae7e9dd6b216436b5ce30333c147cce35382a37033c1e0db301' 
  AND token = 'i7xN5BahivZXfyGHuPBJkLzoSxp2RDgRxnNukVEqYMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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