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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b62fd9a2d983e1a9892a9a31cc08859f891879e9eeb0666c6d33374fdeca5c' 
  AND token = 'iuni3x8kOGZzwGteyYHGIQOab0YlvzNs2LJ7NnOBuaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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