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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b733b056bc4d09e5d7b8b0a18d5aacd9c71c0bd226fb5f08d307d9a5ac6557' 
  AND token = 'OAAeoXvJoMgE1l942jkGPreSH1pmMaMR/qMsnIYfh8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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