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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7cbce6aa354db3a54c13575d59363a891bef1b63cbbe5eb3b73176c3e8e942' 
  AND token = 'jIovwzWsPgjvU9uK/66eens8Imh7b9MXh+4efvkY1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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