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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bf872216320c257f1ff1c96d47aa4e20cb2e3147079034d833772815f23ae8' 
  AND token = 'blgZrLgkmEVr+MEfAzJI9N4zIXgY5bKSly9gopfSRo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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