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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd63d2cdcef6a8ee80e8cb586aa7eb996f8dc015a3bcebb179cdf1a94e4825b' 
  AND token = '8Ms9lK8oj3gWdXjmcY+iETCY1cdJyCaQY++hTirErD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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