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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191cb6e945c1932d941166829f41152df0ea621bfa9733147dd6dc189dcfd663' 
  AND token = '6KsWvp5n+Jn8Exms2NKvJZl7d7x0gFprzstaJ3vceDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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