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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21390dd7b058622aa9bc4f8015ec7a4899cb38f7fbc04207865a9de4ad9d9f90' 
  AND token = 'J9WPk0KiVTQ1AkbNy1pequXoq63E9sovurc7/O2XCaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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