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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c95cb6525f05fbdb190238c848f30ff39bb8e93001e3f44476087d6e348084e' 
  AND token = '4fdzipXmLWOamBw1KfsIGgrVDSpQ72C+56NmA32Rjik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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