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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bb3f7fec9fcbde408059a736ab7abaa4ae5b89a39b44284549f39ba9d315b7' 
  AND token = 'MAMB78G7tInP8Ehl+sy8azdxpUCt1kd0PqQJMFWjkg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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