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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dceb8f41a677d03862eddef8282c3e72a88ea123f4343bf9a5a1731a43827a09' 
  AND token = 'u0NqwWvp198LvpdEdDlhYMYf9lqrqaWvXsqVQT383h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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