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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c400486cb7fc9c0be3464b1beb068442201bfb1f76c5edeb6660a0d3695a0da' 
  AND token = 'ByzFOqMyJ4Yaplslb2wpu42s+YIhX3iMjqB2c4g+L4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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