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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38892b020d085c22fb33d3248b28505568a2722f8f72f43a58a81d91a1122ca' 
  AND token = 'DdHXYSr6t08w55oiX5TsOybt8+l6XcFo4yqwtM0x1QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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