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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f636c6c1180acd1b78bd667cd4c121ea55a96fc36fbb63295be4fa3a51d09a' 
  AND token = 'PG4Q4K8Mse9Ay8lPkp7Gl/YtM4fu0BUG+xRtb9MKTls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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