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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc889796c08d47cc19f1bcc8d5f86c9a563f39653eb9a41a40e802957c0f6d9d' 
  AND token = 'qTpNO8bWJm0QzPg5naukey40V7cdFLlM9ZAPqxUhLNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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