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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4b461c27807ebd49e1ad58f6ad0bacd377f4f9311e6a8091a20e08c22a17c1' 
  AND token = 'zSSngHonrtytE99obSe8QREsXnc4Xb/edRik/folWJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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