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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737c51647ee16b34a0f26c2825ff8774296dad373f687c743e82a6495ee780d0' 
  AND token = 'WAQR2znfa+KrPktOOfJfy5xwWikxlwJNn4x1gryAIEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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