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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc024179a94d20087a9b0050271726a885cf90909afb329fb452f5149776a81' 
  AND token = 'WxFZCxI0oCt6PMCLhvX4O9UGK0Z6TtinA7gWWrzch7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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