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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd448d1746e334befadf3ec466b705cfafad3555a9280f6a741287184174e4915' 
  AND token = 'FS9q0eAQlUaHQbnzBf1Lg4V7obkSV7Lv0/V5cGKc50M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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