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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd554843f8b152453f159d2af4e04a25ec6cfbeff69491f37a87070c2ce6c62b6' 
  AND token = 'ey9VRZPBTXjxyJNqrxFabjiMYksh6ZMqZr55U6c0bag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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