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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9137521d39140ac6c057adb4b6228cd6aa4bc96fb914ff70884cb18da8c4b0' 
  AND token = '+kUnt7+/cWIk5WtZFvF0rpWWrUfx6adiU2QLXRxqykM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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