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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3996bd970cf0b5a7f5b00b8a135edb7806b397bbf8dc190cf54d83523876f2d2' 
  AND token = 'El0Djo8uySWjblqghRywhWxN5R5WfOtS2woAQtUWGJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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