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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85169b33f6f57d669f9f029d8eab6ae1cd85af1cc7545260a7368c1b8ea3fea3' 
  AND token = 'o+1SmFokCmYNGlNlROO7gtbnUvubDg2GTkV5irb7slY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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