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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e8f1947b7595e17042f83effc64358731f2a739c9d9433138c4483f4951d5a' 
  AND token = 'aCbutZebzsiJed9JCUQ9Qy93k/eSc4AZ1A1gxAGur70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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