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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd9865291a93f7b80e3e33f90c8bfa33971bfc5c20db51236b071a0b3b56f2e' 
  AND token = 'l+cDcemKxrEC7mNArAgwcI3u0B0coabXz9McAQaYXwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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