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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f07426b95659d294e636960381d6d1f0fe59e25b78e1b7c6dfd96e076686d3e' 
  AND token = 'SLgWIpTEZdROcjUnG382KAmIn64gSnLWg5+B6cmSuOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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