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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae04786fcbca5c5ee01be085c21eb416d5bd2f53b9496daea4537f76dfa1b60' 
  AND token = 'zjQ4giNpRFouylaRLHoZvNe2DkQLyxY/3NpLkF9WiJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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