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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4c432a4032cea915a599c01e503945cd6d264224b6444a295f3ee0ae1bb3f1' 
  AND token = 'zBjslW3JL5Ue8rmcjsPgfnNCGvYtzRho0/eY88n2PcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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