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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96023f1982a6fb12a09aa747df2153839e97a1453b524290dae5d93c99dd934e' 
  AND token = 'GGpmXruOnBFbzaQHrSyIeKw8+h6O9zJj9bU81zP31MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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