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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace5b5ac68abb25a0f2dc8151bc56df4a523224731eb10d7a5b30c46448e4aba' 
  AND token = '36HJEboyCkxHQD2QTWFW7xIdF4fGLVScYm6D/Ysqw0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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