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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5e0b406ea6c9ae1c84b97a8dc01920b96902b656e00c6a5176e3cf6d2657c1' 
  AND token = '4cuP5SHIW5UtGGnUeUuWAcHANNd3TV/+HUdh7bvJLrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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