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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472dd4daa6d6658755944d4eeb6e69b7ddc2cca1804c691642cf3c1f6ef70e1f' 
  AND token = '73xIBf4/nInFlLb4agAPCRjWkO3HAMSP58Qa5XgkG+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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