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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a6c30c08284f11ba94bbcc017f3098f6f80331ed372fe65fcf75c78aa223b7' 
  AND token = '/m8/GQJYLHAeNlwHm0wMpeUl/3ktI1HthEvUAuj4yU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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