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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30db112ff84c5fca347b313005dffc0ab118345daa7e9bf60e1ac670cf35bae' 
  AND token = 'pJTnakQoyqv6f5WhU/WM0cLKZwBGH9tWtBS6S7IIN2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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