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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adf073583ffa844147df6314801b4e0ef32a3a6da9bb6ec39e23d8a6ee74fcb' 
  AND token = 'HuZKaC16wUqhGZ0qOX1Ed10+Ch+qOXCyhHRGi014+gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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