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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f79b3d21bcb63f89c0753788cc907a9c310db18173b8e6bec377f8173eb3f2d' 
  AND token = 'fq2pcl5ey9kUzm8IjI8hmdqTQ6kA0vvZepTo1ZCOf4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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