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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbe6b9966a5da3739d599dddfa512e4e809b222db50ce8bba66a4bbe507942f' 
  AND token = '8s0v/DuBXZDTtHODrYk3rn1SGG1CnawsHMs6J0CqtrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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