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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df3d3a83e6f34b68f3c0e1135475458d88bb184ecb8e8e47de812f3db70ac27' 
  AND token = 'le0dkGp5M0ymqVv5Ezt+zeIi2sUnvF2AemxRIFqXOk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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