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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6be9cf30b4838404e070c483341db1eb9d140698631147d4f34b93c3b03c17e' 
  AND token = '2ZM9WIoMe+F9g/lGkWwPN+Dyl7sUMhmFCM4FjBHVeG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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