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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3794961876124ea9bc15b68ba86f6db9febe7520b2f7f9226fdd01f3ef426615' 
  AND token = 'Qyz57LRr87i8bD16rd7anrd4I2tO47Wut4ojOjyHTxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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