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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8145f2338bc5043064004f6187f794e95095091f122f8d275ad0eb4d1b8e70e6' 
  AND token = 'zlY5VL2J+GPaU0Sf/4zEYnrO0ne3X4+9TJ5HGVnE9Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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