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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa52f01a85bf090efbb1bbb49468a8b460abfa5bb758b3401f77087c16091f5f' 
  AND token = 'NwanN3eVhONrr7cWQqjri7IIitqRs51ltf8jrJvjwWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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