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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790dbc51199cd5c8fd07ddd5ea69a194281ab238dd3c4c426277a8b7b9b113ff' 
  AND token = 'UIAg6vTsFlK+Z0TBFssPIgibemzOFd88KvXW3YKDP8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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