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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2cf7089342bbf65883937301b50ad004505d755eaf30bd9db89a23e38cf8fa' 
  AND token = '3skf+M8QbW5qH9Sbx8SE4tjhpUjct945haVx1fJkeEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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