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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3292f65f3d56a96f02538eb683ebd7eb8dde7643cc73d56aa6c44829954b4d4' 
  AND token = 'v3agghVXKSyMs0mJhV7T/b2GR7bD2f74nDLkHZooelI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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