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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84190ff563e150ef82fcad4b7ae9f65d0d6e6067f3e13ad69bda2318fcac1ee' 
  AND token = 'YOWKfSGl41zb0up4smdIAqxSm9UE9ZyyKrcio5NqmdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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